* {
    padding: 0;
    margin: 0;
    border: 0;
}

.box {
    width: 1024px;
    margin: auto;
}

.top {
    width: 100%;
    height: 100px;
    background-color: antiquewhite;
    line-height: 100px;
}

.content {
    width: 100%;
}

.content-left {
    width: 15%;
    float: left;
}

body {
    background-color: whitesmoke;
}

.content-right {
    width: 85%;
    float: left;

}

.foot {
    text-align: center;
    height: 100px;
    line-height: 100px;
}


.main-menu {
    text-align: center;
    margin-top: 3px;
    background-color: #afafaf;
    cursor: pointer;
    padding: 5px 0px;
    font-weight: 700;
    color: white;
}

.main-menu:hover {
    background-color: #cfcfcf;
}

.menu-li {
    list-style: none;
    background-color: #dFdFdF;
    margin-top: 2px;
    cursor: pointer;
    text-align: center;
}

.menu-li:hover {
    background-color: #fcfcfc;
}

.content-left ul {
    display: none;
}

.btn {
    border: 1px solid #f1f1f1;
    background-color: #afafaf;
}

.btn:hover {
    border: 1px solid #f1f1f1;
    background-color: #cfcfcf;
}